Density-Dependent Natural Selection in Drosophila Populations
Summary
Density-dependent natural selection arises when the fitness of individuals varies according to the number of conspecifics sharing limited resources. In Drosophila, larval crowding has been a classic model for exploring how competition, waste accumulation and resource limitation shape life-history evolution. High densities select for traits that maximise resource acquisition and conversion efficiency, alter developmental rates and influence adult morphology, behaviour and immunity. Conversely, low densities favour rapid growth and early reproduction. Experimental evolution in Drosophila has revealed that populations adapted to crowded conditions often evolve improved survivorship, altered feeding behaviour, delayed development and changes in stress tolerance. These adaptations can involve shifts in metabolic pathways, detoxification systems, immune function and gene expression profiles. Density-dependent selection also interacts with ecological factors such as host-plant use, nutrient composition and intraspecific competition, leading to divergent evolutionary trajectories among populations. Understanding these dynamics in Drosophila not only elucidates fundamental processes of ecological adaptation and population stability but also informs pest management and conservation strategies by predicting how insect populations respond to environmental changes and varying resource availability.
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Density-Dependent Natural Selection in Drosophila Populations publication trend
The graph below shows the total number of articles in density-dependent natural selection in drosophila populations across all publications each year (not limited to Nature Index journals).
Technical terms
Density-dependent selection: Natural selection in which individual fitness varies with population density.
Larval crowding: High density of larvae in shared habitat, causing resource competition and waste build-up.
Intraspecific competition: Competition for resources among individuals of the same species.
Transcriptome: The complete set of RNA transcripts produced by the genome under specific conditions.
Detoxification pathways: Biochemical routes by which organisms neutralise or eliminate toxins.
References
- The transcriptomic signature of responses to larval crowding in Drosophila melanogaster. Insect Science (2022).
- Uric acid metabolism modulates diet-dependent responses to intraspecific competition in Drosophila larvae. iScience (2022).
- Evolution of pathogen-specific improved survivorship post-infection in populations of Drosophila melanogaster adapted to larval crowding. PLOS ONE (2021).
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